Land for sale in Hamilton County, Iowa, recently totaled $7 million and 1,000 acres. Hamilton County ranks 60th in the Wrestling State for the combined amount of land currently advertised for sale. Webster City featured the most land for sale. Its economy is defined as agricultural, with 761 farms recorded in the county during the most recent U.S. Census. Farming activities in Hamilton County generate annual revenues of $25 million, the majority of which comes from livestock products. Hamilton County is the 38th largest county (577 square miles) in Iowa. It's located in the Central Iowa region of the state.